如何用纯 CSS 创作一颗逼真的土星

╰+攻爆jí腚メ 2022-04-11 13:54 191阅读 0赞

![1504257-20181206173122604-876541609.png][]

## 效果预览 ##

[在线演示][Link 1]

按下右侧的“点击预览”按钮可以在当前页面预览，点击链接可以全屏预览。

[https://codepen.io/comehope/pen/EpbaQX][https_codepen.io_comehope_pen_EpbaQX]

## 可交互视频 ##

此视频是可以交互的，你可以随时暂停视频，编辑视频中的代码。

请用 chrome, safari, edge 打开观看。

[https://scrimba.com/p/pEgDAM/cBdyeTw][https_scrimba.com_p_pEgDAM_cBdyeTw]

## 源代码下载 ##

[本地下载][Link 2]

每日前端实战系列的全部源代码请从 github 下载：

[https://github.com/comehope/front-end-daily-challenges][https_github.com_comehope_front-end-daily-challenges]

## 代码解读 ##

定义 dom，容器本身表示土星星球，其中的 `ring` 元素表示土星环：

居中显示：

body {
        margin: 0;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: black;
    }

定义容器尺寸：

.saturn {
        width: 20em;
        height: 20em;
        font-size: 20px;
    }

画出土星星球（此为草稿，后面还会细化）：

.saturn {
        position: relative;
    }
    
    .saturn::before,
    .saturn::after {
        content: '';
        position: absolute;
        width: 9em;
        height: 9em;
        background: linear-gradient(
            palegoldenrod 0%,
            tan 10%,
            burlywood 30%,
            palegoldenrod 60%,
            darkgray 100%
        );
        border-radius: 50%;
        left: calc((20em - 9em) / 2);
        top: calc((20em - 9em) / 2);
    }

画出土星环（此为草稿，后面还会细化）：

.rings {
        position: absolute;
        width: inherit;
        height: inherit;
        background: radial-gradient(
            transparent 35%,
            dimgray 40%,
            slategray 50%,
            transparent 60%,
            dimgray 60%,
            slategray 70%,
            transparent 70%
        );
    }

改变观察土星环的视角：

.rings {
        transform: rotateX(75deg);
    }

为了使土星呈现被土星环环绕的效果，把土星分为上下两半，使它们和土星环的图层顺序从底到顶依次为：星球的下半部、土星环、星球的上半部：

.saturn::before {
        clip-path: inset(50% 0 0 0);
    }
    
    .saturn::after {
        clip-path: inset(0 0 50% 0);
    }

至此，画出了土星的整体结构，接下来完善细节。  
为土星环涂上丰富的渐变色：

.rings {
        background: radial-gradient(
            rgba(24,19,25,0) 0%,
            rgba(53,52,51,0) 34%,
            rgba(55,54,52,1) 36%,
            rgba(56,55,53,1) 37%,
            rgba(68,67,66,1) 38%,
            rgba(56,55,53,1) 39%,
            rgba(68,67,66,1) 40%,
            rgba(56,55,53,1) 41%,
            rgba(87,77,76,1) 42%,
            rgba(87,77,76,1) 44%,
            rgba(113,110,103,1) 46%,
            rgba(113,110,103,1) 48%,
            rgba(113,98,93,1) 49%,
            rgba(113,98,93,1) 51%,
            rgba(122,115,105,1) 52%,
            rgba(113,98,93,1) 53%,
            rgba(113,98,93,1) 54%,
            rgba(122,115,105,1) 55%,
            rgba(106,99,89,1) 56%,
            rgba(106,99,89,1) 58%,
            rgba(79,76,76,0) 60%,
            rgba(65,64,70,1) 61%,
            rgba(65,64,70,1) 62%,
            rgba(90,85,89,1) 63%,
            rgba(78,74,73,1) 65%,
            rgba(78,73,74,1) 67%,
            rgba(78,73,74,0) 68%,
            rgba(78,73,75,1) 69%,
            rgba(78,73,75,1) 70%,
            rgba(78,73,76,0) 71%,
            rgba(77,72,76,0) 72%,
            rgba(24,19,25,0) 100%
        );
    }

为星球涂上丰富的渐变色：

.saturn::before,
    .saturn::after {
        background:
            linear-gradient(
                rgba(212,203,174,1) 0%,
                rgba(212,203,174,1) 10%,
                rgba(221,203,157,1) 15%,
                rgba(221,203,157,1) 17%,
                rgba(213,181,143,1) 22%,
                rgba(213,181,143,1) 26%,
                rgba(208,180,158,1) 32%,
                rgba(208,180,158,1) 36%,
                rgba(218,188,162,1) 37%,
                rgba(218,188,162,1) 39%,
                rgba(211,184,157,1) 41%,
                rgba(211,184,157,1) 49%,
                rgba(205,186,156,1) 51%,
                rgba(205,186,156,1) 52%,
                rgba(202,176,153,1) 53%,
                rgba(202,176,153,1) 65%,
                rgba(190,177,145,1) 68%,
                rgba(190,177,145,1) 80%,
                rgba(150,144,130,1) 91%,
                rgba(150,144,130,1) 95%,
                rgba(131,129,117,1) 97%,
                rgba(131,129,117,1) 100%
            );
    }

再为星球增加光照效果：

.saturn::before,
    .saturn::after {
        background:
            radial-gradient(
                circle at top, 
                transparent 40%,
                black
            ),
            radial-gradient(
                transparent 62%,
                black
            ),
            linear-gradient(
                rgba(212,203,174,1) 0%,
                rgba(212,203,174,1) 10%,
                rgba(221,203,157,1) 15%,
                rgba(221,203,157,1) 17%,
                rgba(213,181,143,1) 22%,
                rgba(213,181,143,1) 26%,
                rgba(208,180,158,1) 32%,
                rgba(208,180,158,1) 36%,
                rgba(218,188,162,1) 37%,
                rgba(218,188,162,1) 39%,
                rgba(211,184,157,1) 41%,
                rgba(211,184,157,1) 49%,
                rgba(205,186,156,1) 51%,
                rgba(205,186,156,1) 52%,
                rgba(202,176,153,1) 53%,
                rgba(202,176,153,1) 65%,
                rgba(190,177,145,1) 68%,
                rgba(190,177,145,1) 80%,
                rgba(150,144,130,1) 91%,
                rgba(150,144,130,1) 95%,
                rgba(131,129,117,1) 97%,
                rgba(131,129,117,1) 100%
            );
    }

最后，把画面旋转一点角度：

.saturn {
        transform: rotate(-15deg);
    }

大功告成！

原文地址：https://segmentfault.com/a/1190000015798428

[1504257-20181206173122604-876541609.png]: /images/20220411/c7172b491d1747aaac8251576edee425.png
[Link 1]: https://www.jqhtml.com/yanshi?demourl=%2Fwp-content%2Fuploads%2F2018%2F11%2Ffront-end-daily-challenges-master%2F092-saturn&demotitle=%E7%94%A8%E7%BA%AF%20CSS%20%E5%88%9B%E4%BD%9C%E4%B8%80%E9%A2%97%E9%80%BC%E7%9C%9F%E7%9A%84%E5%9C%9F%E6%98%9F
[https_codepen.io_comehope_pen_EpbaQX]: https://codepen.io/comehope/pen/EpbaQX
[https_scrimba.com_p_pEgDAM_cBdyeTw]: https://scrimba.com/p/pEgDAM/cBdyeTw
[Link 2]: http://www.jqhtml.com/20639.html
[https_github.com_comehope_front-end-daily-challenges]: https://github.com/comehope/front-end-daily-challenges